Camera optical lens

ABSTRACT

A camera optical lens includes, from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. At least one of the first lens to the eighth lens has a free-form surface, and the camera optical lens satisfies: −7.50≤f2/f6≤−1.50; and −6.00≤R1/R2≤−0.18, where f2 denotes a focal length of the second lens, f6 denotes a focal length of the sixth lens, R1 denotes a curvature radius of an object-side surface of the first lens, and R2 denotes a curvature radius of an image-side surface of the first lens. The camera optical lens has good optical performance, as well as a large aperture, ultra-thinness and a wide angle.

TECHNICAL FIELD

The present disclosure relates to the field of optical lenses, and moreparticularly, to a camera optical lens suitable for handheld terminaldevices such as smart phones and digital cameras, and suitable forcamera devices such as monitors and PC lenses.

BACKGROUND

With development of the imaging lenses, higher and higher requirementsare put forward for imaging of the lens. The “night scene photography”and “background blur” of the lens have also become important indicatorsto measure an imaging of the lens. The structures in the related arthave insufficient refractive power distribution, lens spacing and lensshape settings, resulting in insufficient ultra-thinness andinsufficient wide angle of the lenses. Moreover, a rotationallysymmetric aspherical surface is mostly used, but such aspherical surfacehas a sufficient degree of freedom only in a meridian plane, and cannotcorrect aberration well. A free-form surface is a surface notrotationally symmetric, and can better balance aberration and improveimaging quality. Besides, the technology of processing for a free-formsurface is gradually mature. Thus, with increasing requirements for lensimaging, it is very important to provide a free-form surface whendesigning a camera lens, especially in the design of a wide-angle andultra-wide-angle lens.

SUMMARY

In view of the above-mentioned problems, a purpose of the presentdisclosure is to provide a camera optical lens, which has a largeaperture, a wide angle, and ultra-thinness, as well as excellent opticalperformance.

An embodiment of the present disclosure provides a camera optical lens.The camera optical lens includes, from an object side to an image side,a first lens, a second lens, a third lens, a fourth lens, a fifth lens,a sixth lens, a seventh lens, and an eighth lens. At least one of thefirst lens, the second lens, the third lens, the fourth lens, the fifthlens, the sixth lens, the seventh lens, or the eighth lens has afree-form surface, and the camera optical lens satisfies:

−7.50≤f2/f6≤−1.50; and

−6.00≤R1/R2≤−0.18,

where f2 denotes a focal length of the second lens, f6 denotes a focallength of the sixth lens, R1 denotes a curvature radius of anobject-side surface of the first lens, and R2 denotes a curvature radiusof an image-side surface of the first lens.

As an improvement, the camera optical lens satisfies:

4.00≤d5/d6≤9.00,

where d5 denotes an on-axis thickness of the third lens, and d6 denotesan on-axis distance from an image-side surface of the third lens to anobject-side surface of the fourth lens.

As an improvement, the camera optical lens satisfies:

−4.14≤f1/f≤−1.07;

−1.36≤(R1+R2)/(R1−R2)≤1.07; and

0.03≤d1/TTL≤0.14,

where f denotes a focal length of the camera optical lens, f1 denotes afocal length of the first lens, d1 denotes an on-axis thickness of thefirst lens, and TTL denotes a total optical length from the object-sidesurface of the first lens to an image plane of the camera optical lensalong an optic axis.

As an improvement, the camera optical lens satisfies:

−28.38≤f2/f≤8.13;

−12.87≤(R3+R4)/(R3−R4)≤18.86; and

0.02≤d3/TTL≤0.07,

where f denotes a focal length of the camera optical lens, R3 denotes acurvature radius of an object-side surface of the second lens, R4denotes a curvature radius of an image-side surface of the second lens,d3 denotes an on-axis thickness of the second lens, and TTL denotes atotal optical length from the object-side surface of the first lens toan image plane of the camera optical lens along an optic axis an opticallength of the camera optical lens.

As an improvement, the camera optical lens satisfies:

0.53≤f3/f≤10.57;

−6.72≤(R5+R6)/(R5−R6)≤−0.10; and

0.02≤d5/TTL≤0.12,

where f denotes a focal length of the camera optical lens, f3 denotes afocal length of the third lens, R5 denotes a curvature radius of anobject-side surface of the third lens, R6 denotes a curvature radius ofan image-side surface of the third lens, d5 denotes an on-axis thicknessof the third lens, and TTL denotes a total optical length from theobject-side surface of the first lens to an image plane of the cameraoptical lens along an optic axis.

As an improvement, the camera optical lens satisfies:

0.65≤f4/f≤7.26;

0.14≤(R7+R8)/(R7−R8)≤6.79; and

0.03≤d7/TTL≤0.15,

where f denotes a focal length of the camera optical lens, f4 denotes afocal length of the fourth lens, R7 denotes a curvature radius of anobject-side surface of the fourth lens, R8 denotes a curvature radius ofan image-side surface of the fourth lens, d7 denotes an on-axisthickness of the fourth lens, and TTL denotes a total optical lengthfrom the object-side surface of the first lens to an image plane of thecamera optical lens along an optic axis.

As an improvement, the camera optical lens satisfies:

−8.07≤f5/f≤−1.92;

0.02≤(R9+R10)/(R9−R10)≤6.14; and

0.02≤d9/TTL≤0.06,

where f denotes a focal length of the camera optical lens, f5 denotes afocal length of the fifth lens, R9 denotes a curvature radius of anobject-side surface of the fifth lens, R10 denotes a curvature radius ofan image-side surface of the fifth lens, d9 denotes an on-axis thicknessof the fifth lens, and TTL denotes a total optical length from theobject-side surface of the first lens to an image plane of the cameraoptical lens along an optic axis an optical length of the camera opticallens.

As an improvement, the camera optical lens satisfies:

6.00≤f6/f≤2.97;

−1.17≤(R11+R12)/(R11−R12)≤0.60; and

0.05≤d11/TTL≤0.16,

where f denotes a focal length of the camera optical lens, R11 denotes acurvature radius of an object-side surface of the sixth lens, and R12denotes a curvature radius of an image-side surface of the sixth lens,d11 denotes an on-axis thickness of the sixth lens, and TTL denotes atotal optical length from the object-side surface of the first lens toan image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens satisfies:

0.41≤f7/f≤1.99;

0.26≤(R13+R14)/(R13−R14)≤5.59; and

0.04≤d13/TTL≤0.20,

where f denotes an focal length of the camera optical lens, f7 denotes afocal length of the seventh lens, R13 denotes a curvature radius of anobject-side surface of the seventh lens, R14 denotes a curvature radiusof an image-side surface of the seventh lens, d13 denotes an on-axisthickness of the seventh lens, and TTL denotes a total optical lengthfrom the object-side surface of the first lens to an image plane of thecamera optical lens along an optic axis an optical length of the cameraoptical lens.

As an improvement, the camera optical lens satisfies:

−2.74≤f8/f≤−0.82;

1.15≤(R15+R16)/(R15−R16)≤4.00; and

0.03≤d15/TTL≤0.16,

where f denotes a focal length of the camera optical lens, f8 denotes afocal length of the eighth lens, R15 denotes a curvature radius of anobject-side surface of the eighth lens, R16 denotes a curvature radiusof an image-side surface of the eighth lens, d15 denotes an on-axisthickness of the eighth lens, and TTL denotes a total optical lengthfrom the object-side surface of the first lens to an image plane of thecamera optical lens along an optic axis an optical length of the cameraoptical lens.

The camera optical lens of the present disclosure has good opticalperformance, as well as a large aperture, ultra-thinness and a wideangle, and is suitable for mobile phone camera lens assembly and WEBcamera lens composed of imaging elements for high pixel such as CCD andCMOS.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood withreference to the following drawings. The components in the drawings arenot necessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the present disclosure. Moreover,in the drawings, like reference numerals designate corresponding partsthroughout the several views.

FIG. 1 is a schematic structural diagram of a camera optical lensaccording to Embodiment 1 of the present disclosure;

FIG. 2 illustrates a situation where RMS spot diameter of the cameraoptical lens shown in FIG. 1 is located in a first quadrant;

FIG. 3 is a schematic structural diagram of a camera optical lensaccording to Embodiment 2 of the present disclosure;

FIG. 4 illustrates a situation where RMS spot diameter of the cameraoptical lens shown in FIG. 3 is located in a first quadrant;

FIG. 5 is a schematic structural diagram of a camera optical lensaccording to Embodiment 3 of the present disclosure; and

FIG. 6 illustrates a situation where RMS spot diameter of the cameraoptical lens shown in FIG. 5 is located in a first quadrant;

FIG. 7 is a schematic structural diagram of a camera optical lensaccording to Embodiment 4 of the present disclosure; and

FIG. 8 illustrates a situation where RMS spot diameter of the cameraoptical lens shown in FIG. 7 is located in a first quadrant.

DESCRIPTION OF EMBODIMENTS

In order to better illustrate the purpose, technical solutions andadvantages of the present disclosure, the embodiments of the presentdisclosure will be described in details as follows with reference to theaccompanying drawings. However, it should be understood by those skilledin the art that, technical details are set forth in the embodiments ofthe present disclosure so as to better illustrate the presentdisclosure. However, the technical solutions claimed in the presentdisclosure can be achieved without these technical details and variouschanges and modifications based on the following embodiments.

Embodiment 1

With reference to FIG. 1, the present disclosure provides a cameraoptical lens 10. FIG. 1 illustrates a camera optical lens 10 accordingto Embodiment 1 of the present disclosure. The camera optical lens 10includes eight lenses. Specifically, the camera optical lens 10includes, from an object side to an image side, a first lens L1, asecond lens L2, an aperture S1, a third lens L3, a fourth lens L4, afifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lensL8. Optical elements such as an optical filter GF can be providedbetween the eighth lens L8 and an image plane Si. As an example, thefirst lens L1 is made of a plastic material, the second lens L2 is madeof a plastic material, the third lens L3 is made of a plastic material,the fourth lens L4 is made of a plastic material, the fifth lens L5 ismade of a plastic material, the sixth lens L6 is made of a plasticmaterial, the seventh lens L7 is made of a plastic material, and theeighth lens L8 is made of a plastic material. In other embodiments, eachlens can be made of another material.

As an example, at least one of the first lens L1, the second lens L2,the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lensL6, the seventh lens L7, or the eighth lens L8 includes a free-formsurface, and the free-form surface contributes to correction ofaberrations such as astigmatism, field curvature, and distortion in awide-angle optical system, thereby improving the imaging quality.

The camera optical lens satisfies the following condition:−7.50≤f2/f6≤−1.50, where f2 denotes a focal length of the second lensL2, and f6 denotes a focal length of the sixth lens L6. This conditionspecifies a ratio of the focal length of the second lens L2 to the focallength of the sixth lens L6. With this condition, the imaging qualitycan be improved.

The camera optical lens satisfies the following condition:−6.00≤R1/R2≤−0.18, where R1 denotes a curvature radius of an object-sidesurface of the first lens L1, and R2 denotes a curvature radius of animage-side surface of the first lens L1. This condition specifies ashape of the first lens L1. With this condition, a degree of lightdeflection is reduced and the imaging quality can be improved.

As an example, the camera optical lens satisfies the followingcondition: 4.00≤d5/d6≤9.00, where d5 denotes an on-axis thickness of thethird lens L3, and d6 denotes an on-axis distance from an image-sidesurface of the third lens L3 to an object-side surface of the fourthlens L4. With this condition, the field curvature of the system isbalanced and the imaging quality is improved.

As an example, the first lens L1 has a negative refractive power andincludes an object-side surface being concave in a paraxial region andan image-side surface being concave in the paraxial region.

As an example, the camera optical lens satisfies the followingcondition: −4.14≤f1/f≤−1.07 where f denotes a focal length of the cameraoptical lens 10, and f1 denotes a focal length of the first lens L1.This condition specifies a ratio of the focal length of the first lensL1 to the focal length f. With this condition, the first lens L1 has anappropriate negative refractive power, which can reduce aberration ofthe system and achieve ultra-thin and wide-angle lens. As an example,the camera optical lens satisfies the following condition:−2.59≤f1/f≤−1.34.

As an example, the camera optical lens satisfies the followingcondition: −1.36≤(R1+R2)/(R1−R2)≤1.07, where R1 denotes a curvatureradius of an object-side surface of the first lens L1, and R2 denotes acurvature radius of an image-side surface of the first lens L1. Byreasonably controlling a shape of the first lens L1, the first lens L1can effectively correct spherical aberration of the system. As anexample, the camera optical lens satisfies the following condition:−0.85≤(R1+R2)/(R1−R2)≤0.85.

As an example, the camera optical lens satisfies the followingcondition: 0.03≤d1/TTL≤0.14, where d1 denotes an on-axis thickness ofthe first lens L1, and TTL denotes a total optical length from theobject-side surface of the first lens to an image plane of the cameraoptical lens 10 along an optic axis. With this condition, it isbeneficial to achieving ultra-thinness. As an example, the cameraoptical lens satisfies the following condition: 0.05≤d1/TTL≤0.11.

As an example, the second lens L2 has a positive refractive power andincludes an object-side surface being convex in a paraxial region and animage-side surface being concave in the paraxial region.

As an example, the camera optical lens satisfies the followingcondition: −28.38≤f2/f≤8.13, where f denotes a focal length of thecamera optical lens 10, and f2 denotes a focal length of the secondlens. By controlling the focal power of the second lens L2 within areasonable range, it is beneficial to correcting aberration of theoptical system. As an example, the camera optical lens satisfies thefollowing condition: −17.74≤f2/f≤6.50.

As an example, the camera optical lens satisfies the followingcondition: −12.87≤(R3+R4)/(R3−R4)≤18.86, where R3 denotes a curvatureradius of an object-side surface of the second lens L2, and R4 denotes acurvature radius of an image-side surface of the second lens L2. Thiscondition specifies a shape of the second lens L2. With this conditionand the development of ultra-thinness and wide-angle lenses, it isbeneficial to correcting longitudinal aberration. As an example, thecamera optical lens satisfies the following condition:−8.04≤(R3+R4)/(R3−R4)≤15.09.

As an example, the camera optical lens satisfies the followingcondition: 0.02≤d3/TTL≤0.07, where d3 denotes an on-axis thickness ofthe second lens, and TTL denotes a total optical length from theobject-side surface of the first lens to an image plane of the cameraoptical lens along an optic axis. With this condition, it is beneficialto achieving ultra-thinness. As an example, the camera optical lenssatisfies the following condition: 0.03≤d3/TTL≤0.06.

As an example, the third lens L3 has a positive refractive power andincludes an object-side surface being convex in a paraxial region and animage-side surface being convex in the paraxial region.

As an example, the camera optical lens satisfies the followingcondition: 0.53≤f3/f≤10.57. Reasonable distribution of focal powerenables the system to have better imaging quality and lower sensitivity.As an example, the camera optical lens satisfies the followingcondition: 0.84≤f3/f≤8.46.

As an example, the camera optical lens satisfies the followingcondition: −6.72≤(R5+R6)/(R5−R6)≤−0.10, where R5 denotes a curvatureradius of an object-side surface of the third lens L3, and R6 denotes acurvature radius of an image-side surface of the third lens L3. Thiscondition specifies a shape of the third lens L3. With the condition, itis beneficial to alleviating a degree of deflection of light passingthrough the lens and effectively reducing aberration. As an example, thecamera optical lens satisfies the following condition:−4.20≤(R5+R6)/(R5−R6)≤−0.12.

As an example, the camera optical lens satisfies the followingcondition: 0.02≤d5/TTL≤0.12, where d5 denotes an on-axis thickness ofthe third lens, and TTL denotes a total optical length from theobject-side surface of the first lens to an image plane of the cameraoptical lens along an optic axis. With this condition, it is beneficialto achieving ultra-thinness. As an example, the camera optical lenssatisfies the following condition: 0.04≤d5/TTL≤0.10.

As an example, the fourth lens L4 has a positive refractive power andincludes an object-side surface being concave in a paraxial region andan image-side surface being convex in the paraxial region.

As an example, the camera optical lens satisfies the followingcondition: 0.65≤f4/f≤7.26, where f denotes a focal length of the cameraoptical lens 10, and f4 denotes a focal length of the fourth lens L4.This condition specifies a ratio of the focal length of the fourth lensL4 to the focal length of the system. With this condition, theperformance of the optical system can be improved. As an example, thecamera optical lens satisfies the following condition: 1.04≤f4/f≤5.80.

As an example, the camera optical lens satisfies the followingcondition: 0.14≤(R7+R8)/(R7−R8)≤6.79, where R7 denotes a curvatureradius of an object-side surface of the fourth lens L4, and R8 denotes acurvature radius of an image-side surface of the fourth lens L4. Thiscondition specifies a shape of the fourth lens L4. With this conditionand the development of ultra-thin and wide-angle lenses, it isbeneficial to correcting aberration of an off-axis angle. As an example,the camera optical lens satisfies the following condition:0.23≤(R7+R8)/(R7−R8)≤5.43.

As an example, the camera optical lens satisfies the followingcondition: 0.03≤d7/TTL≤0.15. With this condition, it is beneficial toachieving ultra-thinness. As an example, the camera optical lenssatisfies the following condition: 0.05≤d7/TTL≤0.12.

As an example, the fifth lens L5 has a negative refractive power andincludes an object-side surface being concave in a paraxial region andan image-side surface being convex in the paraxial region.

As an example, the camera optical lens satisfies the followingcondition: −8.07≤f5/f≤−1.92, where f denotes a focal length of thecamera optical lens 10, and f5 denotes a focal length of the fifth lensL5. The limitation on the fifth lens L5 can effectively smooth a lightangle of the camera lens, and reduce tolerance sensitivity. As anexample, the camera optical lens satisfies the following condition:−5.05≤f5/f≤−2.40.

As an example, the camera optical lens satisfies the followingcondition: 0.02≤(R9+R10)/(R9−R10)≤6.14, where R9 denotes a curvatureradius of an object-side surface of the fifth lens, and R10 denotes acurvature radius of an image-side surface of the fifth lens. Thiscondition specifies a shape of the fifth lens L5. With this conditionand development of ultra-thin and wide-angle lenses, it is beneficial tocorrecting aberration of an off-axis angle. As an example, the cameraoptical lens satisfies the following condition:0.03≤(R9+R10)/(R9−R10)≤4.92.

As an example, the camera optical lens satisfies the followingcondition: 0.02≤d9/TTL≤0.06, where d9 denotes an on-axis thickness ofthe fifth lens, and TTL denotes a total optical length from theobject-side surface of the first lens to an image plane of the cameraoptical lens along an optic axis. With this condition, it is beneficialto achieving ultra-thinness. As an example, the camera optical lenssatisfies the following condition: 0.03≤d9/TTL≤0.05.

As an example, the sixth lens L6 has a negative refractive power andincludes an object-side surface being concave in a paraxial region andan image-side surface being convex in the paraxial region.

As an example, the camera optical lens satisfies the followingcondition: −6.00≤f6/f≤2.97, where f denotes a focal length of the cameraoptical lens 10 and f6 denotes a focal length of the sixth lens L6.Reasonable distribution of focal power enables the system to have betterimaging quality and lower sensitivity. As an example, the camera opticallens satisfies the following condition: −3.75≤f6/f≤2.37.

As an example, the camera optical lens satisfies the followingcondition: −1.17≤(R11+R12)/(R11−R12)≤0.60, where R11 denotes a curvatureradius of an object-side surface of the sixth lens, R12 denotes acurvature radius of an image-side surface of the sixth lens. Thiscondition defines a shape of the sixth lens L6. With this condition andthe development of ultra-thin and wide-angle lenses, it is beneficial tocorrecting aberration of an off-axis angle. As an example, the cameraoptical lens satisfies the following condition:−0.73≤(R11+R12)/(R11−R12)≤0.48.

As an example, the camera optical lens satisfies the followingcondition: 0.05≤d11/TTL≤0.16, where d11 denotes an on-axis thickness ofthe sixth lens L6, and TTL denotes a total optical length from theobject-side surface of the first lens to an image plane of the cameraoptical lens 10 along an optic axis. With this condition, it isbeneficial to achieving ultra-thinness. As an example, the cameraoptical lens satisfies the following condition: 0.07≤d11/TTL≤0.13.

As an example, the seventh lens L7 has a positive refractive power andincludes an object-side surface being convex in a paraxial region and animage-side surface being convex in the paraxial region.

As an example, the camera optical lens satisfies the followingcondition: 0.41≤f7/f≤1.99, where f denotes a focal length of the cameraoptical lens, and f7 denotes a focal length of the seventh lens.Reasonable distribution of focal power enables the system to have betterimaging quality and lower sensitivity. As an example, the camera opticallens satisfies the following condition: 0.66≤f7/f≤1.59.

As an example, the camera optical lens satisfies the followingcondition: 0.26≤(R13+R14)/(R13−R14)≤5.59, where R13 denotes a curvatureradius of an object-side surface of the seventh lens, and R14 denotes acurvature radius of an image-side surface of the seventh lens. Thiscondition specifies a shape of the seventh lens L7. With this conditionand the development of ultra-thin and wide-angle lenses, it isbeneficial to correcting aberration of an off-axis angle. As an example,the camera optical lens satisfies the following condition:0.41≤(R13+R14)/(R13−R14)≤4.47.

As an example, the camera optical lens satisfies the followingcondition: 0.04≤d13/TTL≤0.20, where d13 denotes an on-axis thickness ofthe seventh lens, and TTL denotes a total optical length from theobject-side surface of the first lens to an image plane of the cameraoptical lens along an optic axis. With this condition, it is beneficialto achieving ultra-thinness. As an example, the camera optical lenssatisfies the following condition: 0.06≤d13/TTL≤0.16.

As an example, the eighth lens L8 has a negative refractive power andincludes an object-side surface being convex in a paraxial region and animage-side surface being concave in the paraxial region.

As an example, the camera optical lens satisfies the followingcondition: −2.74≤f8/f≤−0.82, where f denotes a focal length of thecamera optical lens, and f8 denotes a focal length of the eighth lens.Reasonable distribution of refractive power enables the system to havebetter imaging quality and lower sensitivity. As an example, the cameraoptical lens satisfies the following condition: −1.71≤f8/f≤−1.02.

As an example, the camera optical lens satisfies the followingcondition: 1.15≤(R15+R16)/(R15−R16)≤4.00, where R15 denotes a curvatureradius of an object-side surface of the eighth lens, and R16 denotes acurvature radius of an image-side surface of the eighth lens. Thiscondition specifies a shape of the eighth lens. With this condition andthe development of ultra-thinness and wide-angle lenses, it isbeneficial to correcting aberration of an off-axis angle. As an example,the camera optical lens satisfies the following condition:1.84≤(R15+R16)/(R15−R16)≤3.20.

As an example, the camera optical lens satisfies the followingcondition: 0.03≤d15/TTL≤0.16, where d15 denotes an on-axis thickness ofthe eighth lens, and TTL denotes a total optical length from theobject-side surface of the first lens to an image plane of the cameraoptical lens along an optic axis. With this condition, it is beneficialto achieving ultra-thinness. As an example, the camera optical lenssatisfies the following condition: 0.05≤d15/TTL≤0.13.

As an example, an F value (FNO) of the camera optical lens 10 is smallerthan or equal to 2.06, which can reach a large aperture and excellentimaging performance. As an example, FNO is smaller than or equal to2.02.

As an example, a ratio of the optical length TTL of the camera opticallens to the full FOV image height IH (in a diagonal direction), i.e.,TTL/IH, is smaller than or equal to 2.07, which is beneficial toachieving ultra-thinness. The FOV in the diagonal direction is largerthan or equal to 119°, which is beneficial to achieving a wide angle.

As an example, the optical length TTL of the camera optical lens 10 issmaller than or equal to 6.82 mm, which is beneficial to achievingultra-thinness. As an example, the optical length TTL is smaller than orequal to 6.51 mm.

When the above-mentioned condition is satisfied, the camera optical lens10 has good optical performance, and when the free-form surface isadopted, the designed image plane area can be matched with an actual usearea, thereby improving the image quality of the effective area to thegreatest extent; and according to the characteristics of the cameraoptical lens 10, the camera optical lens 10 is suitable for a mobilephone camera lens assembly and a WEB camera lens composed of imagingelements for high pixels such as CCD and CMOS.

The camera optical lens 10 of the present disclosure will be describedin the following by examples. The reference signs described in eachexample are as follows. The unit of the focal length, the on-axisdistance, the curvature radius, and the on-axis thickness is mm.

TTL: the optical length (an on-axis distance from the object-sidesurface of the first lens L1 to the image plane), in a unit of mm.

FNO: a ratio of an effective focal length of the camera optical lens toan entrance pupil diameter.

Table 1 and Table 2 show design data of the camera optical lens 10according to the Embodiment 1 of the present disclosure. Herein, theobject-side surface and image-side surface of the eighth lens L8 arefree-form surfaces.

TABLE 1 R d nd νd S1 ∞ d0= −2.035 R1 −2.451 d1= 0.562 nd1 1.5444 ν156.43 R2 12.925 d2= 0.761 R3 2.032 d3= 0.302 nd2 1.6610 ν2 20.53 R42.780 d4= 0.332 R5 2.727 d5= 0.502 nd3 1.5444 ν3 56.43 R6 −11.680 d6=0.087 R7 −705.655 d7= 0.496 nd4 1.5444 ν4 56.43 R8 −1.725 d8= 0.094 R9−11.081 d9= 0.240 nd5 1.6800 ν5 18.40 R10 5.296 d10= 0.157 R11 −3.286d11= 0.563 nd6 1.5444 ν6 56.43 R12 12.510 d12= 0.045 R13 3.280 d13=0.484 nd7 1.5444 ν7 56.43 R14 −1.020 d14= 0.040 R15 1.622 d15= 0.422 nd81.6032 ν8 28.29 R16 0.664 d16= 0.600 R17 ∞ d17= 0.210 ndg 1.5168 νg64.17 R18 ∞ d18= 0.267

Herein, the representation of each reference sign is as follows.

S1: aperture;

R: curvature radius at a center of an optical surface;

R1: curvature radius of an object-side surface of a first lens L1;

R2: curvature radius of an image-side surface of the first lens L1;

R3: curvature radius of an object-side surface of a second lens L2;

R4: curvature radius of an image-side surface of the second lens L2;

R5: curvature radius of an object-side surface of a third lens L3;

R6: curvature radius of an image-side surface of the third lens L3;

R7: curvature radius of an object-side surface of a fourth lens L4;

R8: curvature radius of an image-side surface of the fourth lens L4;

R9: curvature radius of an object-side surface of a fifth lens L5;

R10: curvature radius of an image-side surface of the fifth lens L5;

R11: curvature radius of an object-side surface of a sixth lens L6;

R12: curvature radius of an image-side surface of the sixth lens L6;

R13: curvature radius of an object-side surface of a seventh lens L7;

R14: curvature radius of an image-side surface of the seventh lens L7;

R15: curvature radius of an object-side surface of an eighth lens L8;

R16: curvature radius of an image-side surface of the eighth lens L8;

R17: curvature radius of an object-side surface of an optical filter GF;

R18: curvature radius of an image-side surface of the optical filter GF;

d: on-axis thickness of the lens, and on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object-side surface ofthe first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 tothe object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 tothe object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5to the object-side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8to the object-side surface of the optical filter GF;

d17: on-axis thickness of optical filter GF;

d18: on-axis distance from the image-side surface of the optical filterGF to the image plane;

nd: refractive index of d-line;

nd1: refractive index of d-line of the first lens L1;

nd2: refractive index of d-line of the second lens L2;

nd3: refractive index of d-line of the third lens L3;

nd4: refractive index of d-line of the fourth lens L4;

nd5: refractive index of d-line of the fifth lens L5;

nd6: refractive index of d-line of the sixth lens L6;

nd7: refractive index of d-line of the seventh lens L7;

nd8: refractive index of d-line of the eighth lens L8;

ndg: refractive index of d-line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

v8: abbe number of the eighth lens L8; and

vg: abbe number of the optical filter GF.

Table 2 shows aspherical data of each lens in the camera optical lens 10according to the Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspherical coefficient k A4 A6 A8 A10 A12 R1−2.1735E+01 8.7919E−02 −4.6917E−02 2.0514E−02 −6.6389E−03 1.5286E−03 R2−9.7627E+00 2.8125E−01 −2.5352E−01 3.1294E−01 −3.4717E−01 3.0653E−01 R3−6.8027E−01 7.5412E−02  1.5424E−01 −9.1125E−01   3.6275E+00 −7.9100E+00 R4  8.5687E+00 1.1697E−01 −1.6126E−01 1.3011E+00 −3.6367E+00 5.6310E+00R5 −1.7451E+00 4.0933E−02  5.3046E−02 −1.2770E−01   2.7512E−01−2.6487E−01  R6  8.2783E+00 −1.3991E−01  −1.4861E−01 4.2741E−01−6.8194E−01 1.2217E+00 R7 −7.4500E+00 −1.3417E−01  −3.8861E−02−8.1326E−01   3.1440E+00 −5.0951E+00  R8  9.5296E−01 −2.6658E−02 −3.2829E−01 8.1228E−01 −1.9573E+00 3.7530E+00 R9  7.2732E+00−2.7722E−01  −4.0999E−01 1.5422E+00 −5.0185E+00 1.0913E+01 R10−1.0000E+01 −1.6587E−01  −1.5286E−01 7.5505E−01 −1.7545E+00 2.5664E+00R11 −7.3541E+00 −2.1559E−02  −2.6282E−01 1.3271E+00 −3.1841E+004.2540E+00 R12 −4.4258E+00 2.6897E−02 −1.7878E+00 3.7085E+00 −3.9391E+002.2581E+00 R13  2.2279E+00 4.1058E−01 −1.4407E+00 2.6511E+00 −3.0221E+002.0678E+00 R14 −6.9072E−01 8.3778E−01 −6.7989E−01 8.6379E−01 −1.2414E+001.1112E+00 Conic coefficient Aspherical coefficient k A14 A16 A18 A20 R1−2.1735E+01 −2.4061E−04 2.4519E−05 −1.4552E−06 3.8258E−08 R2 −9.7627E+00−1.9074E−01 7.6555E−02 −1.7476E−02 1.6955E−03 R3 −6.8027E−01  9.8680E+00−6.5357E+00   1.7238E+00 0.0000E+00 R4  8.5687E+00 −3.3713E+00−3.8162E−01   0.0000E+00 0.0000E+00 R5 −1.7451E+00  0.0000E+000.0000E+00  0.0000E+00 0.0000E+00 R6  8.2783E+00 −8.8214E−01 0.0000E+00 0.0000E+00 0.0000E+00 R7 −7.4500E+00  4.4154E+00 −1.5676E+00  0.0000E+00 0.0000E+00 R8  9.5296E−01 −4.0478E+00 1.8943E+00 −1.0309E−010.0000E+00 R9  7.2732E+00 −1.3087E+01 7.6560E+00 −1.6415E+00 0.0000E+00R10 −1.0000E+01 −2.0862E+00 8.6127E−01 −1.4160E−01 0.0000E+00 R11−7.3541E+00 −3.1280E+00 1.1897E+00 −1.8366E−01 0.0000E+00 R12−4.4258E+00 −4.0908E−01 −2.8785E−01   1.8567E−01 −3.2422E−02  R13 2.2279E+00 −8.2788E−01 1.7416E−01 −1.3021E−02 −5.0648E−04  R14−6.9072E−01 −5.8802E−01 1.8231E−01 −3.0683E−02 2.1676E−03

z=(cr ²)/{1+[1−(k+1)(c ² r ²)]^(1/2) }+A4r ⁴ +A6r ⁶ +A8r ⁸ +A10r ¹⁰+A12r ¹² +A14r ¹⁴ +A16r ¹⁶ +A18r ¹⁸ +A20r ²⁰  (1),

where k represents a Conic coefficient, A4, A6, A8, A10, A12, A14, A16,A18, and A20 represent aspherical coefficients, c represents thecurvature at the center of the optical surface, r represents a verticaldistance between a point on an aspherical curve and the optical axis,and Z represents an aspherical depth (a vertical distance between apoint on an aspherical surface, having a distance of r from the opticaxis, and a surface tangent to a vertex of the aspherical surface on theoptic axis).

For convenience, the aspherical surface of each lens adopts theaspherical surface shown in the above equation (1). However, the presentdisclosure is not limited to the aspherical surface defined by thepolynomial form expressed by the equation (1).

Table 3 shows free-form surface data in the camera optical lens 10according to the Embodiment 1 of the present disclosure.

TABLE 3 Free−form surface coefficient k X⁴Y⁰ X²Y² X⁰Y⁴ X⁶Y⁰ X⁴Y² X²Y⁴X⁰Y⁶ R15 −1.4107E+00 −2.1545E−01 −4.3232E−01 −2.1485E−01 −3.8388E−01−1.1519E+00  −1.1500E+00  −3.8415E−01  R16 −3.5724E+00 −2.0298E−01−4.0660E−01 −2.0184E−01  1.3092E−01 3.9213E−01 3.9331E−01 1.3056E−01X⁸Y⁰ X⁶Y² X⁴Y⁴ X²Y⁶ X⁰Y⁸ X¹⁰Y⁰ X⁸Y² X⁶Y⁴ R15  9.0693E−01  3.6281E+00 5.4419E+00  3.6277E+00  9.0669E−01 −8.9063E−01  −4.4531E+00 −8.9066E+00  R16 −4.9166E−02 −1.9653E−01 −2.9479E−01 −1.9668E−01−4.9302E−02 5.0563E−03 2.5342E−02 5.0543E−02 X⁴Y⁶ X²Y⁸ X⁰Y¹⁰ X¹²Y⁰ X¹⁰Y²X⁸Y⁴ X⁶Y⁶ X⁴Y⁸ R15 −8.9069E+00 −4.4537E+00 −8.9054E−01  5.0225E−01 3.0136E+00 7.5338E+00 1.0045E+01 7.5338E+00 R16  5.0627E−02  2.5237E−02 5.1232E−03  3.5508E−03  2.1300E−02 5.3233E−02 7.1001E−02 5.3247E−02X²Y¹⁰ X⁰Y¹² X¹⁴Y⁰ X¹²Y² X¹⁰Y⁴ X⁸Y⁶ X⁶Y⁸ X⁴Y¹⁰ R15  3.0134E+00 5.0220E−01 −1.7475E−01 −1.2233E+00 −3.6700E+00 −6.1164E+00 −6.1163E+00  −3.6696E+00  R16  2.1309E−02  3.5473E−03 −1.6824E−03−1.1777E−02 −3.5335E−02 −5.8882E−02  −5.8883E−02  −3.5332E−02  X²Y¹²X⁰Y¹⁴ X¹⁶Y⁰ X¹⁴Y² X¹²Y⁴ X¹⁰Y⁶ X⁸Y⁸ X⁶Y¹⁰ R15 −1.2231E+00 −1.7470E−01 3.7495E−02  2.9997E−01  1.0498E+00 2.0997E+00 2.6246E+00 2.0998E+00 R16−1.1769E−02 −1.6834E−03  3.2755E−04  2.6200E−03  9.1700E−03 1.8341E−022.2926E−02 1.8344E−02 X⁴Y¹² X²Y¹⁴ X⁰Y¹⁶ X¹⁸Y⁰ X¹⁶Y² X¹⁴Y⁴ X¹²Y⁶ X¹⁰Y⁸R15  1.0499E+00  3.0000E−01  3.7507E−02 −4.6006E−03 −4.1405E−02−1.6561E−01  −3.8639E−01  −5.7966E−01  R16  9.1710E−03  2.6239E−03 3.2929E−04 −3.1395E−05 −2.8251E−04 −1.1298E−03  −2.6361E−03 −3.9545E−03  X⁸Y¹⁰ X⁶Y¹² X⁴Y¹⁴ X²Y¹⁶ X⁰Y¹⁸ X²⁰Y⁰ X¹⁸Y² X¹⁶Y⁴ R15−5.7967E−01 −3.8638E−01 −1.6561E−01 −4.1349E−02 −4.6174E−03 2.4909E−042.4899E−03 1.1210E−02 R16 −3.9542E−03 −2.6363E−03 −1.1292E−03−2.8188E−04 −3.1981E−05 1.2152E−06 1.2152E−05 5.4685E−05 X¹⁴Y⁶ X¹²Y⁸X¹⁰Y¹⁰ X⁸Y¹² X⁶Y¹⁴ X⁴Y¹⁶ X²Y¹⁸ X⁰Y²⁰ R15  2.9899E−02  5.2307E−02 6.2765E−02  5.2286E−02  2.9852E−02 1.1130E−02 2.4566E−03 2.5191E−04 R16 1.4589E−04  2.5506E−04  3.0598E−04  2.5529E−04  1.4516E−04 5.4330E−051.1445E−05 1.2601E−06

$\begin{matrix}{{z = {\frac{{cr}^{2}}{1 + \sqrt{1 - {\left( {1 + k} \right)c^{2}r^{2}}}} + {\sum_{i = 1}^{N}{B_{i}{E_{i}\left( {x,y} \right)}}}}},} & (2)\end{matrix}$

where k represents a conic coefficient, Bi represents a free-formsurface coefficient, c represents the curvature at the center of theoptical surface, r represents a vertical distance between the a point onthe free-form surface and the optical axis, x represents the x-directioncomponent of r, y represents the y-direction component of r, and zrepresents aspherical depth (a vertical distance between a point on anaspherical surface, having a distance of r from the optic axis, and asurface tangent to a vertex of the aspherical surface on the opticaxis).

For convenience, each free-form surface uses an extended polynomialsurface shown in the above formula (2). However, the present disclosureis not limited to the free-form surface polynomial form expressed by theformula (2).

FIG. 2 shows a situation where the RMS spot diameter of the cameraoptical lens 10 according to Embodiment 1 is located in a firstquadrant. According to FIG. 2, it can be seen that the camera opticallens 10 according to the Embodiment 1 can achieve good imaging quality.

The following Table 13 shows numerical values in each of the embodiments1-4, and the parameters already specified in the condition.

As shown in Table 13, Embodiment 1 satisfies respective condition.

As an example, an entrance pupil diameter ENPD of the camera opticallens 10 is 1.000 mm, the full FOV image height IH (in a diagonaldirection) is 6.000 mm, the image height in an x direction is 4.800 mm,the image height in a y direction is 3.600 mm, and the imaging effect isthe best in this rectangular area; the FOV in a diagonal direction is119.99°, the FOV in the x direction is 107.00°, and the FOV in the ydirection is 89.94°. The camera optical lens 10 satisfies the designrequirements of a wide angle and ultra-thinness, and its on-axis andoff-axis color aberration is sufficiently corrected, and the cameraoptical lens 10 has excellent optical characteristics.

Embodiment 2

The Embodiment 2 is basically the same as the Embodiment 1, and thereference signs in the Embodiment 2 are the same as those in theEmbodiment 1, and only a difference thereof will be described in thefollowing.

As an example, the image-side surface of the third lens L3 is concave inthe paraxial region, and the object-side surface of the fourth lens L4is convex in the paraxial region.

Table 4 and Table 5 show design data of the camera optical lens 20according to the Embodiment 2 of the present disclosure. Herein, theobject-side surface and the image-side surface of the seventh lens L7are free-form surfaces.

TABLE 4 R d nd νd S1 ∞ d0= −1.908 R1 −2.598 d1= 0.529 nd1 1.5444 ν156.43 R2 9.132 d2= 0.751 R3 2.707 d3= 0.307 nd2 1.6610 ν2 20.53 R4 4.557d4= 0.279 R5 3.339 d5= 0.405 nd3 1.5444 ν3 56.43 R6 6.166 d6= 0.049 R73.457 d7= 0.605 nd4 1.5444 ν4 56.43 R8 −1.910 d8= 0.173 R9 −7.647 d9=0.240 nd5 1.6800 ν5 18.40 R10 7.025 d10= 0.133 R11 −5.479 d11= 0.566 nd61.5444 ν6 56.43 R12 6.610 d12= 0.057 R13 3.194 d13= 0.567 nd7 1.5444 ν756.43 R14 −1.027 d14= 0.043 R15 1.726 d15= 0.459 nd8 1.6032 ν8 28.29 R160.679 d16= 0.600 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.225

Table 5 shows aspherical data of each lens in the camera optical lens 20according to the Embodiment 2 of the present disclosure.

TABLE 5 Conic coefficient Aspherical coefficient k A4 A6 A8 A10 A12 R1−2.5000E+01  1.0612E−01 −6.0750E−02 2.9945E−02 −1.1115E−02 2.9641E−03 R2 1.0000E+01  3.1464E−01 −2.5118E−01 2.8470E−01 −2.3436E−01 1.4344E−01 R3−1.6010E−01  9.9212E−02 −8.2841E−02 6.6513E−01 −1.7788E+00 2.7638E+00 R4 1.0000E+01  1.4326E−01  8.6328E−02 1.9084E−01 −3.4229E−01 9.6615E−01 R5−3.3327E+00  2.7890E−02  1.1135E−01 −3.7553E−01   7.4008E−01−6.6706E−01  R6 −1.0000E+01 −2.6937E−01 −1.9420E−02 9.6076E−02−2.5629E−02 8.2091E−01 R7 −1.0000E+01 −1.7836E−01 −6.3776E−02−1.7144E−01   7.0656E−01 −1.8249E−01  R8  8.5735E−01 −2.9962E−02−3.5622E−01 1.1420E+00 −3.0212E+00 5.2161E+00 R9 −1.0000E+01 −2.8924E−01−2.0617E−01 −2.5360E−02   3.9923E−02 1.8257E+00 R10  5.2206E+00−1.8247E−01  5.4857E−02 −1.3060E−03  −3.7657E−01 1.0828E+00 R11−1.1847E+00 −1.4130E−01  2.8801E−01 1.3781E−01 −1.5126E+00 2.5195E+00R12  1.7590E+00 −2.6397E−02 −1.5283E+00 3.3713E+00 −4.1135E+003.2552E+00 R15 −1.2281E+00 −2.0080E−01 −3.3259E−01 7.9186E−01−7.9715E−01 4.5768E−01 R16 −3.4938E+00 −1.9577E−01  1.5151E−01−8.6276E−02   3.3201E−02 −8.3485E−03  Conic coefficient Asphericalcoefficient k A14 A16 A18 A20 R1 −2.5000E+01 −5.4908E−04 6.6984E−05−4.8215E−06  1.5488E−07 R2  1.0000E+01 −5.1957E−02 7.4815E−03 0.0000E+000.0000E+00 R3 −1.6010E−01 −2.2568E+00 6.7361E−01 0.0000E+00 0.0000E+00R4  1.0000E+01 −1.1566E+00 0.0000E+00 0.0000E+00 0.0000E+00 R5−3.3327E+00  0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 R6 −1.0000E+01−9.4427E−01 0.0000E+00 0.0000E+00 0.0000E+00 R7 −1.0000E+01 −2.7664E−011.0560E−01 0.0000E+00 0.0000E+00 R8  8.5735E−01 −4.7940E+00 1.8353E+000.0000E+00 0.0000E+00 R9 −1.0000E+01 −3.0102E+00 1.3490E+00 0.0000E+000.0000E+00 R10  5.2206E+00 −1.1105E+00 4.9882E−01 −8.4032E−02 0.0000E+00 R11 −1.1847E+00 −1.9104E+00 7.0492E−01 −1.0312E−01 0.0000E+00 R12  1.7590E+00 −1.6775E+00 5.2335E−01 −8.1942E−02 3.7000E−03 R15 −1.2281E+00 −1.5934E−01 3.3543E−02 −3.9664E−03 2.0416E−04 R16 −3.4938E+00  1.3324E−03 −1.2782E−04  6.4985E−06−1.2463E−07 

Table 6 shows the free-form surface data in the camera optical lens 20according to the Embodiment 2 of the present disclosure.

TABLE 6 Free-form surface coefficient k X⁴Y⁰ X²Y² X⁰Y⁴ X⁶Y⁰ X⁴Y² X²Y⁴X⁰Y⁶ R13  2.2537E+00 3.8065E−01 7.6064E−01 3.8056E−01 −1.3455E+00−4.0394E+00 −4.0346E+00 −1.3463E+00 R14 −6.9268E−01 7.4006E−011.4790E+00 7.4016E−01 −6.4220E−01 −1.9279E+00 −1.9241E+00 −6.4393E−01X⁸Y⁰ X⁶Y² X⁴Y⁴ X²Y⁶ X⁰Y⁸ X¹⁰Y⁰ X⁸Y² X⁶Y⁴ R13  2.3475E+00 9.3933E+001.4093E+01 9.3858E+00  2.3476E+00 −2.5302E+00 −1.2651E+01 −2.5309E+01R14  8.8444E−01 3.5389E+00 5.3099E+00 3.5362E+00  8.8549E−01 −1.2066E+00−6.0321E+00 −1.2068E+01 X⁴Y⁶ X²Y8 X⁰Y¹⁰ X¹²Y⁰ X¹⁰Y² X⁸Y⁴ X⁶Y⁶ X⁴Y⁸ R13−2.5304E+01 −1.2649E+01  −2.5299E+00  1.6416E+00  9.8500E+00  2.4625E+01 3.2831E+01  2.4627E+01 R14 −1.2067E+01 −6.0329E+00  −1.2064E+00 1.0108E+00  6.0645E+00  1.5161E+01  2.0214E+01  1.5163E+01 X²Y¹⁰ X⁰Y¹²X¹⁴Y⁰ X¹²Y² X¹⁰Y⁴ X⁸Y⁶ X⁶Y⁸ X⁴Y¹⁰ R13  9.8523E+00 1.6418E+00−6.2079E−01  −4.3456E+00  −1.3036E+01 −2.1726E+01 −2.1728E+01−1.3038E+01 R14  6.0653E+00 1.0108E+00 −5.0495E−01  −3.5349E+00 −1.0604E+01 −1.7673E+01 −1.7674E+01 −1.0604E+01 X²Y¹² X⁰Y¹⁴ X¹⁶Y⁰ X¹⁴Y²X¹²Y⁴ X¹⁰Y⁶ X⁸Y⁸ X⁶Y¹⁰ R13 −4.3455E+00 −6.2081E−01  1.2102E−019.6786E−01  3.3878E+00  6.7757E+00  8.4725E+00  6.7733E+00 R14−3.5347E+00 −5.0506E−01  1.4932E−01 1.1945E+00  4.1810E+00  8.3625E+00 1.0452E+01  8.3623E+00 X⁴Y¹² X²Y¹⁴ X⁰Y¹⁶ X¹⁸Y⁰ X¹⁶Y² X¹⁴Y⁴ X¹²Y⁶ X¹⁰Y⁸R13  3.3869E+00 9.6658E−01 1.2089E−01 −7.3415E−03  −6.6237E−02−2.6457E−01 −6.1847E−01 −9.2509E−01 R14  4.1800E+00 1.1943E+001.4933E−01 −2.4197E−02  −2.1776E−01 −8.7102E−01 −2.0321E+00 −3.0487E+00X⁸Y¹⁰ X⁶Y¹² X⁴Y¹⁴ X²Y¹⁶ X⁰Y¹⁸ X²⁰Y⁰ X¹⁸Y² X¹⁶Y⁴ R13 −9.2673E−01−6.1731E−01  −2.6551E−01  −6.6742E−02  −7.3633E−03 −5.4787E−04−5.3521E−03 −2.4382E−02 R14 −3.0486E+00 −2.0324E+00  −8.7175E−01 −2.1772E−01  −2.4202E−02  1.6586E−03  1.6594E−02  7.4675E−02 X¹⁴Y⁶ X¹²Y⁸X¹⁰Y¹⁰ X⁸Y¹² X⁶Y¹⁴ X⁴Y¹⁶ X²Y¹⁸ X⁰Y²⁰ R13 −6.4345E−02 −1.1473E−01 −1.3615E−01  −1.1374E−01  −6.3459E−02 −2.3872E−02 −4.7652E−03−5.2648E−04 R14  1.9891E−01 3.4831E−01 4.1807E−01 3.4826E−01  1.9935E−01 7.5008E−02  1.6632E−02  1.6625E−03

FIG. 4 shows a situation where the RMS spot diameter of the cameraoptical lens 20 according to the Embodiment 2 is within a firstquadrant. According to FIG. 4, it can be seen that the camera opticallens 20 according to the Embodiment 2 can achieve good imaging quality.

As shown in Table 13, the Embodiment 2 satisfies respective condition.

As an example, the entrance pupil diameter ENPD of the camera opticallens 20 is 1.000 mm, the full FOV image height IH (in a diagonaldirection) is 6.000 mm, the image height in an x direction is 4.800 mm,the image height in a y direction is 3.600 mm, and the imaging effect isthe best in this rectangular area; the FOV in a diagonal direction is119.99°, the FOV in the x direction is 106.86°, and the FOV in the ydirection is 90.50°. The camera optical lens 20 satisfies the designrequirements of a wide angle and ultra-thinness, and its on-axis andoff-axis color aberration is sufficiently corrected, and the cameraoptical lens 20 has excellent optical characteristics.

Embodiment 3

The Embodiment 3 is basically the same as the Embodiment 1, and thereference signs in the Embodiment 2 are the same as those in theEmbodiment 1, and only a difference thereof will be described in thefollowing.

The second lens L2 has a negative refractive power, the object-sidesurface of the fifth lens L5 is convex in the paraxial region, the sixthlens L6 has a positive refractive power, the object-side surface of thesixth lens L6 is convex in the paraxial region, the image-side surfaceof the sixth lens L6 is convex in the paraxial region, the object-sidesurface of the seventh lens L7 is convex in the paraxial region, and theaperture S1 is located between the first lens L1 and the second lens L2.

Table 7 and Table 8 show design data of the camera optical lens 30according to the Embodiment 3 of the present disclosure. The object-sidesurface and the image-side surface of the first lens L1 are free-formsurfaces.

TABLE 7 R d nd νd S1 ∞ d0= −0.796 R1 −11.860 d1= 0.339 nd1 1.5444 ν155.82 R2 2.221 d2= 0.359 R3 2.415 d3= 0.174 nd2 1.5444 ν2 55.82 R4 2.035d4= 0.050 R5 2.103 d5= 0.251 nd3 1.5444 ν3 55.82 R6 −2.813 d6= 0.059 R7−3.433 d7= 0.342 nd4 1.5444 ν4 55.82 R8 −2.190 d8= 0.052 R9 3.394 d9=0.222 nd5 1.6613 ν5 20.37 R10 2.062 d10= 0.164 R11 7.365 d11= 0.569 nd61.5444 ν6 55.82 R12 −3.161 d12= 0.186 R13 −1.529 d13= 0.698 nd7 1.5444ν7 55.82 R14 −0.882 d14= 0.032 R15 1.731 d15= 0.541 nd8 1.6449 ν8 22.54R16 0.786 d16= 0.454 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18=0.481

Table 8 shows aspherical data of each lens in the camera optical lens 30according to the Embodiment 3 of the present disclosure.

TABLE 8 Conic coefficient Aspherical coefficient k A4 A6 A8 A10 A12 R3 4.8536E+00  2.1318E−01 −8.8093E−01  4.3789E+00 −1.4277E+01  3.0087E+01R4 −7.8970E−01 −1.5850E−02 −1.8617E−02  1.1758E−02 9.0267E−02 1.9048E−01R5 −9.7458E−01 −1.2065E−02 −8.8603E−03 −8.8167E−04 1.8790E−02 1.9619E−02R6 −3.6191E+01  6.3550E−02  2.8648E−01 −2.7130E−01 −3.1962E−01 6.2446E−01 R7 −4.3046E+01  1.8157E−01 −5.6187E−02 −3.5756E−01 1.3171E−014.0040E−01 R8  2.7931E−01 −1.3686E−01  5.7723E−01 −2.8337E+00 5.4828E+00−5.7820E+00  R9 −1.7343E+01 −5.1714E−01  1.3167E+00 −4.4116E+008.0592E+00 −1.0371E+01  R10 −5.6006E−01 −4.8662E−01  1.0022E+00−2.2670E+00 3.0261E+00 −2.5045E+00  R11 −3.4772E+01 −1.7949E−01 3.9377E−01 −7.4151E−01 1.0195E+00 −9.3349E−01  R12  3.4854E+00 4.9817E−02 −6.5218E−01  2.6287E+00 −6.4985E+00  9.2368E+00 R13 3.7213E−02  3.8121E−01 −6.6118E−01  1.6298E+00 −2.9402E+00  2.9004E+00R14 −2.4110E+00  2.5140E−02  6.2480E−02 −2.8827E−01 7.2900E−01−9.1828E−01  R15 −1.2194E+01 −6.6051E−02 −3.6110E−01  7.8307E−01−1.1791E+00  1.2203E+00 R16 −4.3147E+00 −1.4632E−01  9.1534E−02−4.8031E−02 1.9296E−02 −5.9531E−03  Conic coefficient Asphericalcoefficient k A14 A16 A18 A20 R3  4.8536E+00 −2.9830E+01  −1.2283E+00−9.0233E+00  4.6715E+01 R4 −7.8970E−01 2.7222E−01  2.1100E−02−9.7007E−01 −3.2478E+00 R5 −9.7458E−01 3.4994E−02  1.0777E−01−1.5163E−01 −2.1855E+00 R6 −3.6191E+01 1.8286E+00 −2.8068E+00 2.1715E+00 −9.8240E+00 R7 −4.3046E+01 −2.5795E−01  −1.3540E+00 2.6435E+00 −3.6558E+00 R8  2.7931E−01 1.8607E+00  4.3538E−01−3.7281E−01  2.6832E+00 R9 −1.7343E+01 7.3375E+00 −1.6850E+00 4.8110E−01  4.9017E−01 R10 −5.6006E−01 1.1648E+00 −2.0065E−01 1.1934E−02  3.1157E−03 R11 −3.4772E+01 4.9522E−01 −1.0265E−01 1.0110E−03 −2.9769E−03 R12  3.4854E+00 −7.8860E+00   4.0865E+00−1.1954E+00  1.5392E−01 R13  3.7213E−02 −1.5474E+00   4.1460E−01−4.0067E−02 −1.9349E−04 R14 −2.4110E+00 5.8931E−01 −1.8594E−01 2.2673E−02  1.6715E−04 R15 −1.2194E+01 −8.4070E−01   3.5526E−01−8.1315E−02  7.6625E−03 R16 −4.3147E+00 1.3280E−03 −1.9556E−04 1.6716E−05 −6.1864E−07

Table 9 shows free-form surface data in the camera optical lens 30according to the Embodiment 3 of the present disclosure.

TABLE 9 Free-form surface coefficient k X⁴Y⁰ X²Y² X⁰Y⁴ X⁶Y⁰ X⁴Y² X²Y⁴X⁰Y⁶ R1 −7.4607E+02 2.9550E−01 5.9073E−01  2.9545E−01 −3.8163E−01−1.1447E+00 −1.1445E+00 −3.8162E−01 R2 −2.6144E+00 6.5220E−01 1.3025E+00 6.5193E−01 −3.5676E−01 −1.0762E+00 −1.0719E+00 −3.5691E−01 X⁸Y⁰ X⁶Y²X⁴Y⁴ X²Y⁶ X⁰Y⁸ X¹⁰Y⁰ X⁸Y² X⁶Y⁴ R1  3.1238E−01 1.2497E+00 1.8743E+00 1.2500E+00  3.1243E−01 −2.0895E−01 −1.0447E+00 −2.0899E+00 R2−2.3452E+00 −9.3791E+00  −1.4067E+01  −9.3782E+00 −2.3449E+00 1.9901E+01  9.9511E+01  1.9905E+02 X⁴Y⁶ X²Y⁸ X⁰Y¹⁰ X¹²Y⁰ X¹⁰Y² X⁸Y⁶X⁶Y⁶ X⁴Y⁸ R1 −2.0893E+00 −1.0446E+00  −2.0890E−01   8.4095E−02 5.0459E−01  1.2610E+00  1.6816E+00  1.2615E+00 R2  1.9903E+029.9505E+01 1.9901E+01 −7.1184E+01 −4.2712E+02 −1.0677E+03 −1.4236E+03−1.0677E+03 X²Y¹⁰ X⁰Y¹² X¹⁴Y⁰ X¹²Y² X¹⁰Y⁴ X⁸Y⁶ X⁶Y⁸ X⁴Y¹⁰ R1  5.0475E−018.4133E−02 −1.9716E−02  −1.3805E−01 −4.1476E−01 −6.9298E−01 −6.9058E−01−4.1409E−01 R2 −4.2713E+02 −7.1184E+01  1.2640E+02  8.8475E+02 2.6547E+03  4.4239E+03  4.4237E+03  2.6547E+03 X²Y¹² X⁰Y¹⁴ X¹⁶Y⁰ X¹⁴Y²X¹²Y⁴ X¹⁰Y⁶ X⁸Y⁸ X⁶Y¹⁰ R1 −1.3831E−01 −1.9725E−02  9.3490E−03 7.4701E−02  2.6093E−01  5.2215E−01  6.5111E−01  5.2313E−01 R2 8.8471E+02 1.2640E+02 −9.7023E+01  −7.7631E+02 −2.7162E+03 −5.4335E+03−6.7928E+03 −5.4344E+03 X⁴Y¹² X²Y¹⁴ X⁰Y¹⁶ X¹⁸Y⁰ X¹⁶Y² X¹⁴Y⁴ X¹²Y⁶ X¹⁰Y⁸R1  2.6184E−01 7.4502E−02 9.3089E−03 −4.4323E−03 −3.9948E−02 −1.6009E−01−3.7396E−01 −5.5575E−01 R2 −2.7165E+03 −7.7625E+02  −9.7018E+01 −5.4054E+00 −4.8656E+01 −1.9372E+02 −4.5470E+02 −6.8392E+02 X⁸Y¹⁰ X⁶Y¹²X⁴Y¹⁴ X²Y¹⁶ X⁰Y¹⁸ X²⁰Y⁰ X¹⁸Y² X¹⁶Y⁴ R1 −5.6096E−01 −3.7202E−01 −1.5999E−01  −4.0399E−02 −4.4692E−03  6.5401E−04  6.4589E−03  2.9868E−02R2 −6.7692E+02 −4.5279E+02  −1.9449E+02  −4.8402E+01 −5.3978E+00 3.5257E+01  3.5282E+02  1.5881E+03 X¹⁴Y⁶ X¹²Y⁸ X¹⁰Y¹⁰ X⁸Y¹² X⁶Y¹⁴ X⁴Y¹⁶X²Y¹⁸ X⁰Y²⁰ R1  8.1142E−02 1.3373E−01 1.6029E−01  1.3770E−01  8.2920E−02 2.8982E−02  4.8680E−03  5.4941E−04 R2  4.2202E+03 7.3888E+03 8.8678E+03 7.3928E+03  4.2339E+03  1.5853E+03  3.5372E+02  3.5274E+01

FIG. 6 shows a situation where the RMS spot diameter of the cameraoptical lens 30 according to the Embodiment 3 is located in a firstquadrant. According to FIG. 4, it can be seen that the camera opticallens 30 according to the Embodiment 3 can achieve good imaging quality.

The following Table 13 lists the respective numerical valuecorresponding to each condition according to the above-mentionedcondition. Obviously, the imaging optical system according to thisembodiment satisfies the above-mentioned condition.

As an example, the entrance pupil diameter ENPD of the camera opticallens 30 is 1.042 mm, the full FOV image height IH (in a diagonaldirection) is 6.000 mm, the image height in an x direction is 4.800 mm,the image height in a y direction is 3.600 mm, and the imaging effect isthe best in this rectangular area; the FOV in a diagonal direction is121.90°, the FOV in the x direction is 98.29°, and the FOV in the ydirection is 78.47°. The camera optical lens 30 satisfies the designrequirements of a wide angle and ultra-thinness, and its on-axis andoff-axis color aberration is sufficiently corrected, and the cameraoptical lens 20 has excellent optical characteristics.

Embodiment 4

The Embodiment 4 is basically the same as the Embodiment 1, and thereference signs in the Embodiment 4 are the same as those in theEmbodiment 1, and only a difference thereof will be described in thefollowing.

The second lens L2 has a negative refractive power, the object-sidesurface of the fifth lens L5 is convex in the paraxial region, the sixthlens L6 has a positive refractive power, the object-side surface of thesixth lens L6 is convex in the paraxial region, the image-side surfaceof the sixth lens L6 is convex in the paraxial region, the object-sidesurface of the seventh lens L7 is concave in the paraxial region, andthe aperture S1 is located between the first lens L1 and the second lensL2.

Table 10 and Table 11 show design data of the camera optical lens 40according to the Embodiment 4 of the present disclosure. Herein, theobject-side surface and the image-side surface of the second lens L2 arefree-form surfaces.

TABLE 10 R d nd νd S1 ∞ d0= −0.772 R1 −12.917 d1= 0.361 nd1 1.5444 ν155.82 R2 2.176 d2= 0.308 R3 2.308 d3= 0.173 nd2 1.5444 ν2 55.82 R4 1.968d4= 0.050 R5 2.030 d5= 0.250 nd3 1.5444 ν3 55.82 R6 −2.893 d6= 0.049 R7−3.602 d7= 0.335 nd4 1.5444 ν4 55.82 R8 −2.254 d8= 0.050 R9 3.372 d9=0.220 nd5 1.6613 ν5 20.37 R10 2.044 d10= 0.169 R11 7.101 d11= 0.547 nd61.5444 ν6 55.82 R12 −3.175 d12= 0.188 R13 −1.528 d13= 0.691 nd7 1.5444ν7 55.82 R14 −0.878 d14= 0.035 R15 1.723 d15= 0.538 nd8 1.6449 ν8 22.54R16 0.780 d16= 0.509 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18=0.421

Table 11 shows aspherical data of each lens in the camera optical lens40 according to the Embodiment 4 of the present disclosure.

TABLE 11 Conic coefficient Aspherical coefficient k A4 A6 A8 A10 A12 R1−3.7512E+02  2.9030E−01 −3.8089E−01  3.0985E−01 −2.0615E−01   8.4214E−02R2 −1.9063E+00  6.5590E−01 −3.3023E−01 −2.3397E+00 1.9735E+01−7.0588E+01 R5 −1.1363E+00 −1.5158E−02 −2.0336E−02 −1.6798E−02−3.6884E−03  −9.2063E−03 R6 −3.4691E+01  6.1534E−02  2.8467E−01−3.1322E−01 −3.8686E−01   6.0728E−01 R7 −3.9142E+01  1.8609E−01−5.9143E−02 −3.7957E−01 1.3956E−01  4.5627E−01 R8  1.0443E−01−1.3700E−01  6.1357E−01 −2.9873E+00 5.8991E+00 −6.2843E+00 R9−1.3900E+01 −5.2771E−01  1.3686E+00 −4.6621E+00 8.6592E+00 −1.1329E+01R10 −5.2436E−01 −4.9837E−01  1.0400E+00 −2.3956E+00 3.2538E+00−2.7327E+00 R11 −8.1390E+01 −1.8912E−01  4.0883E−01 −7.8334E−011.0961E+00 −1.0184E+00 R12  3.3723E+00  5.0523E−02 −6.7507E−01 2.7803E+00 −6.9818E+00   1.0083E+01 R13 −1.2851E−02  3.9568E−01−6.8610E−01  1.7239E+00 −3.1587E+00   3.1662E+00 R14 −2.3981E+00 2.5553E−02  6.3667E−02 −3.0532E−01 7.8299E−01 −1.0025E+00 R15−1.1977E+01 −7.1471E−02 −3.7478E−01  8.2843E−01 −1.2666E+00   1.3321E+00R16 −4.1917E+00 −1.5016E−01  9.5241E−02 −5.0791E−02 2.0728E−02−6.4990E−03 Conic coefficient Aspherical coefficient k A14 A16 A18 A20R1 −3.7512E+02 −1.9393E−02   9.0753E−03 −4.5889E−03 6.4254E−04 R2−1.9063E+00 1.2545E+02 −9.6265E+01 −5.4391E+00 3.4895E+01 R5 −1.1363E+00−9.6198E−03  −2.7075E−02 −9.1553E−01 −5.8448E+00  R6 −3.4691E+011.9446E+00 −3.2321E+00  2.8933E+00 −9.0944E+00  R7 −3.9142E+01−1.9911E−01  −1.2749E+00  3.4705E+00 −4.3426E+00  R8  1.0443E−012.1077E+00  5.2931E−01 −4.7160E−01 2.8289E+00 R9 −1.3900E+01 8.1176E+00−1.9444E+00  4.7167E−01 4.1541E−01 R10 −5.2436E−01 1.2910E+00−2.2858E−01  1.0608E−02 8.7990E−04 R11 −8.1390E+01 5.4979E−01−1.1526E−01  1.4419E−03 −3.3421E−03  R12  3.3723E+00 −8.7468E+00  4.6054E+00 −1.3687E+00 1.7917E−01 R13 −1.2851E−02 −1.7162E+00  4.6716E−01 −4.6016E−02 −5.7516E−04  R14 −2.3981E+00 6.5359E−01−2.0955E−01  2.5955E−02 1.9808E−04 R15 −1.1977E+01 −9.3247E−01  4.0036E−01 −9.3117E−02 8.9123E−03 R16 −4.1917E+00 1.4728E−03−2.2038E−04  1.9146E−05 −7.1779E−07 

Table 12 shows free-form surface data in the camera optical lens 40according to the Embodiment 4 of the present disclosure.

TABLE 12 Free-form surface coefficient k X⁴Y⁰ X²Y² X⁰Y⁴ X⁶Y⁰ X⁴Y² X²Y⁴X⁰Y⁶ R3  4.7185E+00  2.1980E−01  4.3797E−01  2.1986E−01 −9.3451E−01−2.8093E+00 −2.8077E+00 −9.3301E−01 R4 −2.2997E+00 −3.7764E−02−7.6944E−02 −3.7545E−02 −1.6098E−02 −8.2244E−02 −6.0061E−02 −1.5232E−02X⁸Y⁰ X⁶Y² X⁴Y⁴ X²Y⁶ X⁰Y⁸ X¹⁰Y⁰ X⁸Y² X⁶Y⁴ R3  4.6038E+00  1.8382E+01 2.7562E+01  1.8400E+01  4.6042E+00 −1.5322E+01 −7.6717E+01 −1.5319E+02R4  3.4932E−02  1.3155E−01  2.5267E−01  1.2246E−01  3.5353E−02 1.1213E−01  6.7347E−01  1.3495E+00 X⁴Y⁶ X²Y⁸ X⁰Y¹⁰ X¹²Y⁰ X¹⁰Y² X⁸Y⁴X⁶Y⁶ X⁴Y⁸ R3 −1.5343E+02 −7.6645E+01 −1.5323E+01  3.3005E+01  1.9801E+02 4.9562E+02  6.6059E+02  4.9564E+02 R4  1.2269E+00  5.2057E−01 1.1254E−01  1.3985E−01  8.7027E−01  2.9376E+00  3.2952E+00  2.5233E+00X²Y¹⁰ X⁰Y¹² X¹⁴Y⁰ X¹²Y² X¹⁰Y⁴ X⁸Y⁶ X⁶Y⁸ X⁴Y¹⁰ R3  1.9804E+02  3.2996E+01−3.2648E+01 −2.2845E+02 −6.8182E+02 −1.1383E+03 −1.1392E+03 −6.8369E+02R4  8.8374E−01  1.4779E−01  1.0415E−02  3.4918E−02  4.6325E+00 1.4286E−01  1.3343E−01  2.2273E+00 X²Y¹² X⁰Y¹⁴ X¹⁶Y⁰ X¹⁴Y² X¹²Y⁴ X¹⁰Y⁶X⁸Y⁸ X⁶Y¹⁰ R3 −2.2859E+02 −3.2665E+01 −7.7537E−01 −6.8986E+00−2.1005E+01 −4.3637E+01 −5.7066E+01 −4.5209E+01 R4  6.8689E−02−3.1469E−03 −7.3724E−01 −6.1069E+00 −2.1408E+01 −3.8504E+01 −4.9062E+01−3.9021E+01 X⁴Y¹² X²Y¹⁴ X⁰Y¹⁶ X¹⁸Y⁰ X¹⁶Y² X¹⁴Y⁴ X¹²Y⁶ X¹⁰Y⁸ R3−2.2881E+01 −6.0276E+00 −8.1079E−01 −1.0820E+01 −1.0055E+02 −3.7250E+02−8.7515E+02 −1.3381E+03 R4 −1.6923E+01 −5.7798E+00 −7.4708E−01−2.2548E+00 −2.4020E+01 −5.2989E+01 −1.6789E+02 −2.6513E+02 X⁸Y¹⁰ X⁶Y¹²X⁴Y¹⁴ X²Y¹⁶ X⁰Y¹⁸ X²⁰Y⁰ X¹⁸Y² X¹⁶Y⁴ R3 −1.3376E+03 −9.2230E+02−3.6650E+02 −9.6789E+01 −1.0907E+01  4.7016E+01  4.6572E+02  2.2078E+03R4 −2.7489E+02 −1.2638E+02 −7.6659E+01 −2.0591E+01 −2.2285E+00−2.6362E+00 −4.3222E+01 −6.9534E+01 X¹⁴Y⁶ X¹²Y⁸ X¹⁰Y¹⁰ X⁸Y¹² X⁶Y¹⁴ X⁴Y¹⁶X²Y¹⁸ X⁰Y²⁰ R3  5.8869E+03  1.0137E+04  1.2046E+04  1.0043E+04 5.7274E+03  2.1045E+03  4.7372E+02  4.6810E+01 R4 −3.3188E+02−5.9555E+02 −7.3522E+02 −7.1446E+02 −1.9690E+02 −1.5119E+01 −3.5131E+01−3.3448E+00

FIG. 8 shows a situation where the RMS spot diameter of the cameraoptical lens 40 according to the Embodiment 4 is located in a firstquadrant. According to FIG. 8, it can be seen that the camera opticallens 40 according to the Embodiment 4 can achieve good imaging quality.

The following Table 13 lists the respective numerical valuecorresponding to each condition according to the above-mentionedcondition. Obviously, the imaging optical system according to thisembodiment satisfies the above-mentioned condition.

As an example, the entrance pupil diameter ENPD of the camera opticallens 30 is 1.054 mm, the full FOV image height IH (in a diagonaldirection) is 6.000 mm, the image height in an x direction is 4.800 mm,the image height in a y direction is 3.600 mm, and the imaging effect isthe best in this rectangular area; the FOV in a diagonal direction is122.35°, the FOV in the x direction is 98.71°, and the FOV in the ydirection is 78.16°. The camera optical lens 40 satisfies the designrequirements of a wide angle and ultra-thinness, and its on-axis andoff-axis color aberration is sufficiently corrected, and the cameraoptical lens 20 has excellent optical characteristics.

TABLE 13 Parameters and condition Embodi- Embodi- Embodi- Embodi-expression ment 1 ment 2 ment 3 ment 4 f2/f6 −2.07 −1.74 −6.85 −7.31R1/R2 −0.19 −0.28 −5.34 −5.94 f 1.800 1.800 2.084 2.107 f1 −3.724 −3.646−3.393 −3.378 f2 9.754 9.377 −28.259 −29.895 f3 4.099 12.688 2.241 2.222f4 3.166 2.346 10.081 10.131 f5 −5.188 −5.297 −8.413 −8.310 f6 −4.705−5.396 4.124 4.090 f7 1.484 1.494 2.758 2.743 f8 −2.221 −2.210 −2.854−2.820 FNO 1.80 1.80 2.00 2.00 TTL 6.164 6.198 5.183 5.104 FOV 119.99°119.99° 121.90° 122.35° IH 6.000 6.000 6.000 6.000

It should be understood by those skilled in the art that the aboveembodiments are merely some specific embodiments of the presentdisclosure, and various changes in form and details may be made withoutdeparting from the scope of the present disclosure.

What is claimed is:
 1. A camera optical lens, comprising, from an objectside to an image side, a first lens, a second lens, a third lens, afourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighthlens, wherein at least one of the first lens, the second lens, the thirdlens, the fourth lens, the fifth lens, the sixth lens, the seventh lens,or the eighth lens has a free-form surface, and wherein the cameraoptical lens satisfies:−7.50≤f2/f6≤−1.50; and−6.00≤R1/R2≤−0.18, where f2 denotes a focal length of the second lens,f6 denotes a focal length of the sixth lens, R1 denotes a curvatureradius of an object-side surface of the first lens, and R2 denotes acurvature radius of an image-side surface of the first lens.
 2. Thecamera optical lens as described in claim 1, further satisfying:4.00≤d5/d6≤9.00, where d5 denotes an on-axis thickness of the thirdlens, and d6 denotes an on-axis distance from an image-side surface ofthe third lens to an object-side surface of the fourth lens.
 3. Thecamera optical lens as described in claim 1, further satisfying:−4.14≤f1/f≤−1.07;−1.36≤(R1+R2)/(R1−R2)≤1.07; and0.03≤d1/TTL≤0.14, where f denotes a focal length of the camera opticallens, f1 denotes a focal length of the first lens, d1 denotes an on-axisthickness of the first lens, and TTL denotes a total optical length fromthe object-side surface of the first lens to an image plane of thecamera optical lens along an optic axis.
 4. The camera optical lens asdescribed in claim 1, further satisfying:−28.38≤f2/f≤8.13;−12.87≤(R3+R4)/(R3−R4)≤18.86; and0.02≤d3/TTL≤0.07, where f denotes a focal length of the camera opticallens, R3 denotes a curvature radius of an object-side surface of thesecond lens, R4 denotes a curvature radius of an image-side surface ofthe second lens, d3 denotes an on-axis thickness of the second lens, andTTL denotes a total optical length from the object-side surface of thefirst lens to an image plane of the camera optical lens along an opticaxis.
 5. The camera optical lens as described in claim 1, furthersatisfying:0.53≤f3/f≤10.57;−6.72≤(R5+R6)/(R5−R6)≤−0.10; and0.02≤d5/TTL≤0.12, where f denotes a focal length of the camera opticallens, f3 denotes a focal length of the third lens, R5 denotes acurvature radius of an object-side surface of the third lens, R6 denotesa curvature radius of an image-side surface of the third lens, d5denotes an on-axis thickness of the third lens, and TTL denotes a totaloptical length from the object-side surface of the first lens to animage plane of the camera optical lens along an optic axis.
 6. Thecamera optical lens as described in claim 1, further satisfying:0.65≤f4/f≤7.26;0.14≤(R7+R8)/(R7−R8)≤6.79; and0.03≤d7/TTL≤0.15, where f denotes a focal length of the camera opticallens, f4 denotes a focal length of the fourth lens, R7 denotes acurvature radius of an object-side surface of the fourth lens, R8denotes a curvature radius of an image-side surface of the fourth lens,d7 denotes an on-axis thickness of the fourth lens, and TTL denotes atotal optical length from the object-side surface of the first lens toan image plane of the camera optical lens along an optic axis.
 7. Thecamera optical lens as described in claim 1, further satisfying:−8.07≤f5/f≤−1.92;0.02≤(R9+R10)/(R9−R10)≤6.14; and0.02≤d9/TTL≤0.06, where f denotes a focal length of the camera opticallens, f5 denotes a focal length of the fifth lens, R9 denotes acurvature radius of an object-side surface of the fifth lens, R10denotes a curvature radius of an image-side surface of the fifth lens,d9 denotes an on-axis thickness of the fifth lens, and TTL denotes atotal optical length from the object-side surface of the first lens toan image plane of the camera optical lens along an optic axis.
 8. Thecamera optical lens as described in claim 1, further satisfying:6.00≤f6/f≤2.97;−1.17≤(R11+R12)/(R11−R12)≤0.60; and0.05≤d11/TTL≤0.16, where f denotes a focal length of the camera opticallens, R11 denotes a curvature radius of an object-side surface of thesixth lens, R12 denotes a curvature radius of an image-side surface ofthe sixth lens, d11 denotes an on-axis thickness of the sixth lens, andTTL denotes a total optical length from the object-side surface of thefirst lens to an image plane of the camera optical lens along an opticaxis.
 9. The camera optical lens as described in claim 1, furthersatisfying:0.41≤f7/f≤1.99;0.26≤(R13+R14)/(R13−R14)≤5.59; and0.04≤d13/TTL≤0.20, where f denotes a focal length of the camera opticallens, f7 denotes a focal length of the seventh lens, R13 denotes acurvature radius of an object-side surface of the seventh lens, R14denotes a curvature radius of an image-side surface of the seventh lens,d13 denotes an on-axis thickness of the seventh lens, and TTL denotes atotal optical length from the object-side surface of the first lens toan image plane of the camera optical lens along an optic axis.
 10. Thecamera optical lens as described in claim 1, further satisfying:−2.74≤f8/f≤−0.82;1.15≤(R15+R16)/(R15−R16)≤4.00; and0.03≤d15/TTL≤0.16, where f denotes a focal length of the camera opticallens, f8 denotes a focal length of the eighth lens, R15 denotes acurvature radius of an object-side surface of the eighth lens, R16denotes a curvature radius of an image-side surface of the eighth lens,d15 denotes an on-axis thickness of the eighth lens, and TTL denotes atotal optical length from the object-side surface of the first lens toan image plane of the camera optical lens along an optic axis.